i was wondering if you can put 350 heads on a 305 motor will it work if it wiil what will be the poweer increases and what will the compression be will i still be able to run pump gas????

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CHRIS
1983 firebird transam
edelbrock performer rpm intake 360*k&n intake 160 theroostat gitting trans raced up and lots and lots of plans 4 the future

 

Yes you can put them on. There will be only power losses. Compression will be veeerrryyy low. You can run pump gas. The chambers on 350 heads are 76cc (most factory) 305 have 58 or 64, I can't remember which. This will drop your compression to the "make no power at all area." The valves are a little larger, but with the 305's small bore, the valves will be severely shrouded. In short, don't use them.



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Joshua Johnston
1991 Z-28


350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust,Dynomax Bullet Mufflers, T&R Motorsports custom air intake

 

what about 305 heads on 350? higher compression??

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

 

Yeah it will be higher, but you trade that for smaller valves. I measured some at one time to be 1.74-I, 1.50-E. The static ratio will be higher, but do to the fact that the little valves wont let in as much air/fuel, the VE will drop.



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Joshua Johnston
1991 Z-28


350, T-5, K&N, Ported Vortec heads, Edelbrock RPM, Holley 750 D.P., HEI, 11.07:1 CR, Comp Cams Roller-.510"/.520"-282*/288* dur., Shorty Headers, Dual 2.5 Exhaust,Dynomax Bullet Mufflers, T&R Motorsports custom air intake

 

All 305 heads are 58cc chambers. 3rd gen 305's have 1.84/1.50 valves.

305 heads on a dished-piston 350 might be okay, but would require some bowl and other work to really flow decent. Probably not worth it since real 350 heads are plentiful.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

L98 Heads came with 64 CC