302 heads to 273 - head bolt help

[elm13]

Forgive my ignorance. I hired a guy to rebuild my engine. He decided not to finish so I took it back and am trying to finish myself. I have 302 heads going on the 66 273. He told me I need specialty made head bolts for this application. Where do I get head bolts for 302 heads into a 1966 273?
Thanks for any and all help!

 

[70aarcuda]

Nope...you can use your stock head bolts....just clean them up.....

 

[318willrun]

^^^ correct, and I would question everything else he has done.....

 

[JBurch]

Forgive my ignorance. I hired a guy to rebuild my engine. He decided not to finish so I took it back and am trying to finish myself. I have 302 heads going on the 66 273. He told me I need specialty made head bolts for this application. Where do I get head bolts for 302 heads into a 1966 273?
Thanks for any and all help!

Before you slide the engine back into the car........if you are still using the original 273 exhaust manifolds, check fitment and make sure drivers side lays flat to the head. Due to the reshaping of the head casting when the air ports were added (those can be threaded with a 1/4-20-unc tap and plugged with 1/4-20 set screws), carefully grind off the pad till manifold sits flat.

 

[318willrun]

i put '65 273 manifolds on '85 302 heads no issues. I didn't use gaskets, and sealed perfect. As mentioned above, always good to check. I did plug the smog ports with 1/4 inch set screws.

 

[ValiantRacing]

Intake manifold bolt alignment is going to be different, if you using stock 66 intake

 

[Dartswinger70]

Chevy 302 or Ford 302...I didnt realize they bolted up...ports and water passages work too?

 

[toolmanmike]

Intake manifold bolt alignment is going to be different, if you using stock 66 intake

Nope! 64 and 65 had the odd intake bolt size and angle. 1966 and newer are the same until you get to the Magnum engines then things changed again.

 

[toolmanmike]

Chevy 302 or Ford 302...I didnt realize they bolted up...ports and water passages work too?

Small block Mopar heads with a casting number ending in 302. They were used in about 1985 on the Lean Burn 318's.

 

[Dartswinger70]

Cool man, I was just clowning around. Glad you cleared it up for me. I remember having some 318 heads that I had to plug air injection holes with set screws to run them on a 69 Coronet 500.

 

[BigBlockMopar]

elm, just be very glad he didn't finish it.

 

[brian6pac]

I would check the valve to cyl wall 1.88, 1.60 are .200 wider than the stock valves and depending on your lift they might hit the cyl wall. I know the 2.02, 1.60 will hit the top of the block because the valves are bigger than the bore.

 

[JBurch]

I would check the valve to cyl wall 1.88, 1.60 are .200 wider than the stock valves and depending on your lift they might hit the cyl wall. I know the 2.02, 1.60 will hit the top of the block because the valves are bigger than the bore.

Where are you getting 1.88, 1.6 valves???

 

[toolmanmike]

1.78/1.50 on my chart.

 

[brian6pac]

I thought these were a 360 originally?

 

[RustyRatRod]

I thought these were a 360 originally?

The 360 got the 308 heads.

 

[elm13]

Seriously and sincerely to each one of you —thanks so very much for the great insight and help!!!

I will defiantly double check all the “work” he did.

 

[brian6pac]

learn something new every day

 

[pishta]

I would check the valve to cyl wall 1.88, 1.60 are .200 wider than the stock valves and depending on your lift they might hit the cyl wall. I know the 2.02, 1.60 will hit the top of the block because the valves are bigger than the bore.

1.78/1.60 difference is only .009 wider on the shrouded edge.