When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The first step is the engine swap.
I'm quite confident that the original engine was a 427, tach, front sway bar size and rear axle code, all indicates 427.
What parts do I need for the installation of the
427?
- New motor mounts
- ??
Tanks in advance
PO restored the bottom end of the 427 L36. New forged pistons, the 512 block is decked. Piston spec says deck clearance 0.018. The top of the pistons are flush with the deck.
Is this ok??.
Last edited by bjorn sandin; Nov 3, 2018 at 11:04 AM.
if your clearance is .018, you should be able to fit an 18 thousandths feeler gauge underneath a straightedge on top of the block when the Piston is all the way up at the flat Quench pad. so it is either .018 Down in the Hole or it is flush in which case it is zero decked. And you need to take that into account when you're figuring out what your chamber size and compression ratio is. And also where your valves are when the Piston is almost all the way up.
Last edited by derekderek; Nov 3, 2018 at 11:27 AM.
The top of the pistons? The dome, part with L2300 stamped on it should be about 1/8 above the deck. Piston all the way up, slide a steel ruler or other flat surface over the piston at the flat surface around the dome. The gap is the deck height.
Last edited by derekderek; Nov 3, 2018 at 11:42 AM.
Now that has to be decided. Their standard head gasket is .041 usually crushes to about 38 or so which would give you $38,000 of quench which is I believe pretty close to off optimal.at 2300 piston as a little bit of extra valve relief cut in it and still giving you what 16 cc's of Dome? So how big are your Chambers? What heads?
Now that has to be decided. Their standard head gasket is .041 usually crushes to about 38 or so which would give you $38,000 of quench which is I believe pretty close to off optimal.at 2300 piston as a little bit of extra valve relief cut in it and still giving you what 16 cc's of Dome? So how big are your Chambers? What heads?
Thanks for helping me in this!
I have heads 063. Bigger valves 2" 3/16 intake and higher lift cam 0.510 intake and 0.514 ex. All this together reduces valve-piston clearance. Do you think I'm on critical line here?
Last edited by bjorn sandin; Nov 4, 2018 at 05:18 AM.
Your piston appears to be slightly out of the hole. If so....Fel Pro makes a .051 gasket.....but you need to measure how far out of the hole it is.
Building a 427 costs no more than a 454 or any other big block. As the only difference is the pistons, rods and crank.....what would be the extra expense?
Looks like you got that covered.....but I would measure the pistons and other items before it ran in my garage.
Good luck to you sir....and keep us updated with more pics!
I cut a piece of Plexi and drill a 3/8th Hole. Grease Plexi to seal to head deck. Walmart flavor shooter. 4 buck 30cc syringe. Accurate. That 99 cc's sounds close. 101cc in the book.
I've not checked the head cc yet but did a more accurate check of piston vs deck. Bad news. My piston is 0.008" OUT from the deck. This means that I'm 0.018+0.008=0.027 wrong. But if a 0.040 quench it ok I'll be quite ok with a 0.051 gasket ending up at 0.051-0.008=0.043.
check with the Piston manufacturer and see if they added 15 or 20 thousand to the height to zero deck it without decking the block. You might want to ask them if they can exchange them for Pistons with the original compression height now that the block was decked. on the other hand, you're probably bigger than 101 CC's now with chamber work in the bigger valves. Make sure you measure them find out exactly what you have. Measure your head gasket diameter. There's a difference between 4.3 something and 4.5 something as a measurable amount.
A shelf piston will not have added deck to it. To my knowledge...nobody makes a piston for added deck.
Factory deck for big block Mark 4 was 9.815-9.820 after machining but all piston manufactures go by 9.800 as spec.
I had mentioned this was out of the hole from looking at the photo. Get the .051 head gaskets and bolt it together....no issues here.
I cut a piece of Plexi and drill a 3/8th Hole. Grease Plexi to seal to head deck. Walmart flavor shooter. 4 buck 30cc syringe. Accurate. That 99 cc's sounds close. 101cc in the book.
Done.
Volume was 101 cc with this method. Thanks for guiding me.
I've also ordered 0.051 head gaskets from Summit.
The Cometic MLS Head Gasket just arrived. Instruction says no additional seal compound needed. I'm a bit concerned about the water channels. What are your experience? Do I need to seal the water channels with sealant?
