Question about Pontiac Firebird

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Changing heads for more HP

I have a 69 firebird 400 cid.The heads produce 200 HP.I was wondering if i put on heads that produce 370 to 390 HP would this produce more HP(Horse Power).I was told by a freind no.I needed to change the cam shaft also.Is this true.Thanks John

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If you use the mark vii heads u will boost the compression to almost 9.5 which will increase ur hp but changing cams as well will give u even more hp

Posted on Nov 26, 2008

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What year is this engine? and ci


From this chart - I think you may be misreading the number - 3970010 is possibly the actual number: Which makes the engine pretty old 68-72 350 V8 - 4 bolt main. I included past this number so that you can see that the number you posted doesn't actually exist. And thus my conclusion that the 9 is most likely a 0. Hope this helps. 3970010 350 69 Corvette late 69,4 bolt main 3970010 302 69 Camaro Z/28,Late 69, 4 bolt main 3970010 350 69-79 Truck 2&4 bolt main 3970010 350 69-79 Pass,Chevelle,Camaro,Nova,MonteCarlo 2&4 bolt main 3970010 350 70 Corvette 300,350,370 HP 4 bolt main 3970010 350 71 Corvette 270,330 HP 4 bolt main 3970010 350 72 Corvette 200,255 HP 4 bolt main 3970014 350 69-77 Pass,Chevelle,Camaro, Nova,MonteCarlo 2 or 4 bolt main 3970014 350 69-79 Truck 2 or 4 bolt main 3970014 350 72 Corvette late &undefined;72,200 HP,255HP 4 bolt main 3970020 307 68-73 Pass,Chevelle,Camro, Nova 3970020 307 69-73 Truck 3970024 307 69-73 Pass,Chevelle,Camro, Nova,Truck 3992386 327 68-69 Pass,Chevelle,Camro, Nova,Truck Large Jounal

Oct 13, 2014 | Cars & Trucks

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Pontiac engine codes


1964 - 1979 Pontiac Engine Codes Bold Type is for manual transmissionStarting in '73,2nd HP # is for Dual Exhaust 1964 326 250 HP 92x,96-0 326 280 HP 94x,97-0 389 230 HP 04L,05L,08R,09R 389 235 HP 22B 389 267 HP 389 283 HP 10A 389 303 HP 25K,26K,27P,28P 389 306 23B,29N 389 325 78X,79J 389 330 32B,34N,33-6 389 348 76X,77J 421 320 35B,38S,43N 421 350 44B,47S,49N 1965 326 250 WP,ZN 326 285 WR,YP 389 256 WA,WB,YA,YB 389 290 WC,YC,YD 389 325 YE,YF 389 333 WE 389 335 WT,YS 389 338 WF,YG 389 360 WS,YR 421 338 HP WG,YH 421 356 WH,YJ 421 376 WJ,YK 1966 326 250 WP,WX,YN,XF 326 285 WR,YP,XG 389 256 WA,WB,YA 389 290 WC,YV,YU,YC,YD 389 325 YX,YL,YW,YF,YE 389 333 WE 389 335 WW,WT,YS,XE 389 360 WV,WS,XS,YR 1967 326 250 HP WP,WX,WC,WH 326 250 HP YO,YN,XF,YJ,XI 326 285 HP WR,XR,WK,WD 326 285 HP YP,XG,YM,XO 400 255 HP XL,XM 400 260 HP 400 265 HP WA,WB 400 265 HP YA,YB,YC,YD 400 290 HP XV,XU 400 293 HP XC 400 325 HP WU,WZ,WQ,WI 400 325 HP YE,YF,YT,XE,XN,XW,XX 400 333 HP WD,WE,WY,XT 400 335 HP WT,WW,YS 400 350 HP XZ,XY,XH,XJ 400 360 HP WS,WV,WR,XS,YZ,XP 428 360 HP WG,Y2,YY 428 376 HP WJ,XK,Y3,YH,Yk 1968 350 265 HP WD,WC,YN,YJ 350 320 HP WR,WK,YP,YM 400 265 HP XM,YA 400 290 HP WA,WB,YC 400 330 HP 400 335 HP WQ,WZ,WI,XN 400 340 HP WU,XT 400 350 HP XZ,XH,YS,YZ 400 360 HP WT,WS,XS,XP 400 366 HP WY,XW 428 375 HP WG,YH 428 390 HP WJ,YK 1969 350 265 HP WC,WP,WM,WU 350 265 HP XL,YJ,XR,YN,XB,YE,YU,XS 350 325 HP WK,WN,XC,XD 350 330 HP WR,WV,XT,XU,YP 400 265 HP XM,YZ,XX,YB,YF 400 290 HP WA,WB,WD,WE,YC,YD 400 330 HP WZ,YT 400 335 HP WQ,YW 400 340 HP 400 345 HP WH,XN 400 350 HP WT,WX,YS,XH 400 366 HP WS,YZ 400 370 HP WW,XP 400 375 HP WI,WY,XY,XW 428 360 HP WG,YL,YH,XE,XJ 428 370 HP WF,XF 428 390 HP WJ,WL,YK,XG 1970 350 255 HP W7,WU,X7,YU 400 265 HP 400 290 HP WE,YD 400 330 HP 400 350 HP WX,WT,XH,YS 400 366 WS,YZ 400 370 WW,WH,XP,XN 455 360 HP WA,YC,YH 455 370 HP WG,XF 1971 350 250 HP WR,WU,WN,WP 350 250 HP XR,YU,YN,YP 400 265 HP WS,WX,XX,YX 400 300 HP WK,WT,YS 455 280 HP WG,YG 455 325 HP WJ,YC 455 335 HP WL,WC,YE 1972 350 160 HP WR,YU,YV,YR 400 200 HP YX,YZ,ZR,ZV,ZX 400 250 HP WK,WS,YS,YT,ZS 455 200 HP 455 220 HP YA,YC,Y4 455 300 WD,WM,YB,YE 1973 350 150,175 HP XR,WV,ZB,ZD 350 150,175 HP Y2,Y7,YR,YV,ZR,ZV 350 150,175 HP WA,WC,WD,WF,WL,WN,XZ 400 170,185 HP W5,XH,XI,X3,X4 400 170,185 HP YI,YP,YX,YZ,Y4,ZK,ZX 400 200,230 HP WK,WS,WP,YN,YX,YT 400 200,230 HP Y3,ZN,ZS,XK,XN,XX 400 200,230 HP XZ,X5,YF,YG,Y6 455 215,250 HP WT,WW,ZZ,ZE,YA,YC 455 215,250 HP YD,YK,ZA,AC,XA,XE,XJ 455 215,250 HP XL,XY,XT,X7,XO,YE 455 290 ZJ,XD 455 310 Z8,X8 1974 350 155,170 HP WA,WB,AA,YA,ZA 350 155,170 HP YB,YC,ZB,YN,YP,YS 350 170,200 HP WN,WP,ZP,YN,YP,YS 400 175,190 HP AH,YH,YJ,ZH,ZJ 400 175,190 HP AD,YF,YK,ZD,ZK 400 200,225 HP WT,WR,Y3,AT,YT 400 200,225 HP YZ,ZT,AD,YL,YM,ZS 455 215,250 HP AU,YR,YU,YW,YX 455 215,250 HP YY,ZU,ZW,ZX,A4 455 215,250 HP 455 290 HP W8,Y8 1975 350 155 HP YB,YA 350 175 HP WN,YN,ZP 400 170 HP 400 185 HP WT,YS,YT,ZT,YM 455 200 HP WX,YU,YW,ZU,ZW 1976 350 160 HP (Early) YB,YA,YP,YR,ZX 350 160 HP (Late) XM,XP,XU,XR,XW,XX,X3,ZF,ZH 350 165 HP 400 170 HP (Early) YJ,YC 400 170 HP (Late) X9,X4,XT,XY,XS,XZ,X8 400 185 HP (Early) WT,Y6,Y7,YS,YT,YY,YZ,ZA,ZK 400 185 HP (Late) WY,X7,ZJ,ZL,X6 455 200 HP WX,Y3,Y4,Z3,Z4,Y8,ZB 1977 301 135 HP WB,YW,YX,YH,YK 350 170 HP YA,YB,XB,XC,Y9 400 180 HP 400 180 HP YU,Y4,XA,Y7,XK 400 200 HP WA,Y6 1978 301 140 HP XA,XC,XL,YM 301 140 HP XD,XB,YL,YP 301 150 HP XF,XH,XU,XW 400 180 HP XJ,XK,X9,YK,YH,YS 400 180 HP YT,YJ,YR,YW,YA,YU 400 220 HP WC,X7 1979 301 135 HP PX7,PX9,PXF 301 135 HP PXH,PXP,PXR 301 150 HP PWA,PWB 301 150 HP PX4,PX6,PXL,PXN 301 150 HP PXS,PXT,PXU,PXW 400 220 HP PWH,LAST 400

Dec 21, 2013 | Cars & Trucks

1 Answer

69 firebird battery not charging


Have you checked the alternator output, and had the battery tested ?

Jun 28, 2013 | 1969 Pontiac Firebird

1 Answer

How do I know which 3.8 is in my 1984 El Camio 229 or 231?


3.8L (229 CID)The 229 cid (3,751 cc) engine was first introduced for the 1980 model year and was produced until 1984. This engine replaced the 250 cid in full-size Chevrolets and Camaros as the new base V6. Additionally, the intermediate Chevrolet Malibu and Monte Carlo also used the 229 cid as a replacement for both the 200 cid V6, and the 231 cid Buick V6. Both the Buick V6 and the 229 cid Chevrolet V6 are 90-degree V6 engines, and both are often referred to as the 3.8L V6. These engines should not be confused as being the same, and are completely unique engine designs.
The 229 cid has a 3.736-inch bore and a 3.48-inch stroke, identical to the Chevrolet 305 cid V8 engine. The 229 cid used the same 2.45-inch main bearing and 2.10-inch rod bearing diameters as the 200 cid V6 engine. Also like the 200 cid V6, the 229 cid used the same crankshaft with the 18-degree offset throws and the same 5.7-inch connecting rods with 0.050-inch narrowed ends. It came equipped with 1.84-inch intake valves and 1.50-inch exhaust valves. The 229 cid V6 was only equipped with a 2-barrel carburetor. For 1980 the 229 cid used a mechanical Dualjet. From 1981 to 1984 the electronic Dualjet was used along with the GM's CCC (Computer Command Control) system. The 229 cid was rated between 110 and 115 hp (86 kW).

Feb 25, 2013 | Chevrolet Cars & Trucks

1 Answer

Change head gasket on 65 mustang 200


Drain antifreeze -DON"T POUR IT DOWN A STORM DRAIN - then remove valve cover, Remove exhaust from head assembly. On this engine the head is also the intake manifold - it's cast as a unit. Remove carb and remove heater hoses from carb base plate. Remove head bolts and discard. Break head loose from block - may have to smack it a time or two to break gasket loose. Get a buddy to help lift the head off the block - it's fairly heavy. Clean gasket surfaces on both head and block. Install new gasket onto block - pay attention to gasket orientation - it goes on only one way correctly. Reverse procedure to re-install - USE NEW HEAD BOLTS! Silly to try to save $20 bucks on bolts and ruin an engine.

May 05, 2012 | 1966 Ford Mustang

1 Answer

Distributor wiring oder for a 80 Ford F150 8 plugs.


255 cid (4.2L), 302 cid (5.0L), 360 cid (5.9L), 390 cid (6.5L), 460 cid (7.5L) V8 engines Firing order: 1-5-4-2-6-3-7-8 Distributor rotation: Counterclockwise

tecnovative_152.gif


351 cid W & M (5.8L), 400 (6.6L) engines Firing order: 1-3-7-2-6-5-4-8 Distributor rotation: Counterclockwise


tecnovative_153.gif

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1 Answer

What is the spark plug gap for a firebird 173 cid


It is on the radiator support,open the hood and look

May 18, 2010 | 1984 Pontiac Firebird

1 Answer

1979 firebird transmission swap question


As long as the transmission tail shafts are the same it should fit nice . check the tail shaft (not drive shaft) they are interchangable if it is longer or shorter.

Sep 02, 2009 | 1979 Pontiac Firebird

1 Answer

No fire on 69 pontiac firebird 350 bigblock.changed coil and distributar still no fire?


It has power on the big pink wire to the distributor with the key on? Also if it has a tach hooked up next to the pink wire, try unhooking it.

Mar 13, 2009 | 1979 Pontiac Firebird

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