Exhaust Valves Set
SBC heads 991 and 993?
answer the question, not say go buy vortexs
I have two sets of heads here 991's(74.5cc) and 993's(76cc), The 991's i pulled from a motor running with 73k and look to be in great shape. the 993 i got for free(were used in racing a bit, so high hard km), but were benched for a while, missing some exhaust valves and need to be redone for sure.
the 991 intakes are just to small at 1.72 intakes. So am i better to get my 991 machined to fit 1.94 or get the 993's redone.
I don't mind stealing parts from one for the other,
Im building a low revving 350 with a X4254h cam, High output HID, Edlebrock Preformmer intake, stock pistions & bore. In a std 4x4 truck, Non-daily driver.
i may change heads later on but this is for now. It is the final piece to my engine.
3998991
but if i get the heads filled do i need new push rods and intake milled?
well i think you all ready know what im going to say, but here's some more info to help you make your choice.
the 993 have small intake runners as well as small valves, the intake runners are only 170s and even smaller exhaust runners, they made them with 74cc chambers to bump up the compression.
and there's two 991s and i would need the casting numbers to know what ones you have, but both have bigger intake runners, one has 200 and the other has a 230 intake runners and both have 180 exhaust runners, and if you have the 991s milled .040 you'll have 72cc chambers.
also the 993s have a valve spring bed that has to be milled out for spring to handle a left of over 480, and the 991s can take a spring with out milling of a left up to 530.
my self i would have the 991s machined for bigger valves and milled for smaller chambers, and i would have the intake and heads match ported.
added info
those are the 200runner heads, but the exhaust runners are 185s, not 180s like i said befor, there are better heads out there but i think you already know that and just so you know summit has a set of 2.020 heads with 220 intake runners, 180 exhaust runners with 68cc chambers for about $700.oo for the pair, and there good to 525 left, with screw in studs
but if your going to still do the 991s up just make sure you have the heads and intake match ported and take the gaskets your going to be useing with them so thay can be match up as well.
as for the push rods, if you mill them .020 no you dont need new ones, if you go the .040 like i said yes youll need to get new ones no less then .020 shorter then the ones you have now, and even good push rods dont cost that much when you taking about push rods for 500 left or less.
Exhaust Valves Set
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