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30 HP is a good gain just by switching heads, but I wouldn't bother with a head swap unless I could bolt on 50 HP, unless something is wrong with the cylinder heads on the truck and you just looking to replace the cylinder heads with some factory cast heads.
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1971 GMC K1500 SWB Fleetside, 4" skyjacker softride and, 14 Bolt FF, HD Dana 44 4.10's
1970 K5 TBI conversion lifted etc SOLD
1968 C20 camper truck SOLD
“To ban guns because criminals use them is to tell the innocent and law-abiding that their rights and liberties depend not on their own conduct, but on the conduct of the guilty and the lawless.” Jeff Snyder
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