about a 75 # weight difference between both sides.
You can tell by the heads. 5.7 has aluminum (silver) 4.3 has steel heads (darker grey or painted black.)
Iron Intake to Iron Heads - 40ft lbs Aluminum Intake - 25ft lbs
I believe the torque is figured on the bolt size, not the material. you are using steel bolts ,therefore the torque for an intake bolt on a sm. block is 20 ft. lbs.
yes, iron block w/ aluminum heads.... ls1 has aluminum block and aluminum heads
With iron heads, the stock spec for iron intakes of 30ft-lb should do. If you are going into aluminum heads, you do not want to go very tight, maybe 20ft-lb or so. AFR recommends just making them "snug" when installing an intake and exhaust headers on their aluminum small block heads.
what is the torque pattern for ford 302 heads?
Aluminum
Heads are aluminum and block is cast iron
I think a hotter cam , aluminum heads and intake probably headers maybe that tougher block I've heard about . Its a much faster car .
There are a variety of places where one can purchase SBC aluminum heads. One can purchase SBC aluminum heads online on the eBay website, and other retailers as well.
The 4.0 liter OHV has cast iron heads , the 4.0 liter SOHC has aluminum heads