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Thread: Help with 355
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post #15 of (permalink) Old Aug 25th, 19, 9:04 PM
Team Member
Join Date: Feb 2010
Location: Upper Sandusky, Ohio
Posts: 2,855
Re: Help with 355

No way that top end kit is 410hp...I have those heads, ran them on my 355 with 9.7:1 comp, clay Smith hyd roller (221/235-.510 lift)...280 hp at the wheels. Ran good, drove good. But no way with their cam it would do 410hp.

Still have the heads on my current ported a bit with much bigger solid roller, more compression etc...335 hp at the wheels. On both motors they were done around 6000rpm. For a street car they are decent heads.

Those new Promaxx heads are worth a look.

'71 Malibu
3580 #, 6.0 LQ4, Summit pistons, Summit 8702 cam, vic jr, AED 750hp, msd 6014, 11.5:1 compression, NOS Cheater plate
T-350, PTC 9" converter, 12 bolt, spool, 3.90 gears, MT ET R 275/60/15

355 [email protected]
125 [email protected]
388 Mud Motor- [email protected]
100 shot [email protected]
'72 Greenbrier Wagon: 454, 700R4, 12 bolt with 3.73
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