this is a big tire no prep car on methanol. I am not saying it is how I would do it but it only goes very few miles. Funny car cage, vw radiator. Probably go watch it run in April so I can give you a report
CK5
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1970 Chevelle Malibu "400" Clone
- Thread starter 80' 427
- Start date
Figured methanol with no intercooler on there. I'm surprised he even has a radiator for that purpose.
Where he Y'd the two turbos together right before the larger tube throttle inlet, it's still small then it steps up in size right after, that will create more heat with the restriction, and a power loss. He should of Y'd it straight into the larger tube. I'm guessing you wouldn't of done that either...
I'd be interested to hear how it runs, a bad@$$ car, no doubt there.
Where he Y'd the two turbos together right before the larger tube throttle inlet, it's still small then it steps up in size right after, that will create more heat with the restriction, and a power loss. He should of Y'd it straight into the larger tube. I'm guessing you wouldn't of done that either...
I'd be interested to hear how it runs, a bad@$$ car, no doubt there.
Assembled far enough to check deck height. looks like I will be using a .050 head gasket after both decks get cut to +.015. Also discovered my cheap crank won't be so cheap. Have to cut the counter weights for piston boss clearance. Oh well. Better to find it now.
I assume the block has been line bored already, so decking will bring them all to within a thou or two of each other?
Maybe I’m way off here, but the 9.8005 is deck height right? So how does the compression height make a difference in deck height?
thanks for the explanation!
Maybe I’m way off here, but the 9.8005 is deck height right? So how does the compression height make a difference in deck height?
thanks for the explanation!
it hasn't been line bored but the crank bores measure in alignment.
I put the crank in and assembled one rod and piston. Then I went to each of the 4 outside holes and ran the piston to tdc. I measured that distance vs the deck. That is where the numbers came from. .Decking will get them all at the same height and the decks square. Yes 9.8 is the deck height of a BBC. Not sure why they push it over. .015 out isn't ideal but will be fine with a thick gasket. Usually everything has a piston .020 in the hole.
Just goes to show how far out some things are on a stick block I nearly always deck to get the quench tight and get the decks square.
one side was within a .002 the other within .003 front to back but it was .008 shorter from one side to the other.
I put the crank in and assembled one rod and piston. Then I went to each of the 4 outside holes and ran the piston to tdc. I measured that distance vs the deck. That is where the numbers came from. .Decking will get them all at the same height and the decks square. Yes 9.8 is the deck height of a BBC. Not sure why they push it over. .015 out isn't ideal but will be fine with a thick gasket. Usually everything has a piston .020 in the hole.
Just goes to show how far out some things are on a stick block I nearly always deck to get the quench tight and get the decks square.
one side was within a .002 the other within .003 front to back but it was .008 shorter from one side to the other.
I know my machinest has said "if you saw how horrible some of the engines from any make are, you would wonder how they lasted as long as they did"
This is the last comment from the attached Chevelles forum thread. https://www.chevelles.com/threads/what-is-a-general-ballpark-deck-height-for-a-virgin-bbc.273916/
"Four blocks I have saved the probed numbers as examples of why we deck everything,,,
Actual probed numbers
I kept them because they were all pretty bad & a good example of the reasons to square things up
Two were 400 small blocks & two were BB's
The nominal deck height for a SB is 9.025 & for a BB 9.800 for the standard deck
The two 400's
Worst one was 9.011 on one corner, 9.031 on the opposite end of the other side.
Sweeping this block from intake to exhaust was over .010 from a 45° using the cam as a datum.
The other was better, 9.019-9.027
One 454 was 9.797 to 9.815
The other was 9.786 to 9.801"
Lots of BBC info on that page
This is the last comment from the attached Chevelles forum thread. https://www.chevelles.com/threads/what-is-a-general-ballpark-deck-height-for-a-virgin-bbc.273916/
"Four blocks I have saved the probed numbers as examples of why we deck everything,,,
Actual probed numbers
I kept them because they were all pretty bad & a good example of the reasons to square things up
Two were 400 small blocks & two were BB's
The nominal deck height for a SB is 9.025 & for a BB 9.800 for the standard deck
The two 400's
Worst one was 9.011 on one corner, 9.031 on the opposite end of the other side.
Sweeping this block from intake to exhaust was over .010 from a 45° using the cam as a datum.
The other was better, 9.019-9.027
One 454 was 9.797 to 9.815
The other was 9.786 to 9.801"
Lots of BBC info on that page
Shiny!
Martin
Martin
Just guessing… 427 Corvette?
