Merlin 345 Grumpy Jenkins flow numbers... Stock and ported??
10-13-2018 | 06:58 AM
#1
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From: Olmsted Falls,Ohio Marblehead,Oh
Merlin 345 Grumpy Jenkins flow numbers... Stock and ported??
AS fall is here I need to refresh heads this winter since valve seals are leaking really bad, wondering what someone might have gotten for flow numbers fully porting and cleaning up 345 Merlins? I know these heads suck and are old school but I own them as they came on the boat, not looking to chase numbers with this boat really but before I do a valve job now would be the time if porting them is worth it....When I need a full refresh is when I will add some CI possibly and more aggressive solid rollers and better heads unless I can get numbers from these heads.
Anyone have ported flow sheets?
Anyone have ported flow sheets?
10-13-2018 | 07:08 AM
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From: St. Pete Beach, FL
10-13-2018 | 08:42 PM
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From: St. Pete Beach, FL
World Products MERLIN 345cc Iron Head Flow Data
Valve Lift--.300 --.400 --.500 --.600 --.700 --.800
2.300 ----- 213 -- 275 -- 326 -- 366 -- 389 -- 374
1.880 ----- 165 -- 204 -- 239 -- 262 – 276 -- 286
Methods used: Superflow 600, Flowed at 28" with a bowl blend 1" down, 1" radiused entry plate on the intake port, No exhaust tube, Using Manley Race Master valves.
Better than I expected TBH. I didn’t realize they made a head that big. What are the rest of the specs on your engines?
Valve Lift--.300 --.400 --.500 --.600 --.700 --.800
2.300 ----- 213 -- 275 -- 326 -- 366 -- 389 -- 374
1.880 ----- 165 -- 204 -- 239 -- 262 – 276 -- 286
Methods used: Superflow 600, Flowed at 28" with a bowl blend 1" down, 1" radiused entry plate on the intake port, No exhaust tube, Using Manley Race Master valves.
Better than I expected TBH. I didn’t realize they made a head that big. What are the rest of the specs on your engines?
10-13-2018 | 08:46 PM
#8
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Joined: Jan 2006
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From: St. Pete Beach, FL
AS fall is here I need to refresh heads this winter since valve seals are leaking really bad, wondering what someone might have gotten for flow numbers fully porting and cleaning up 345 Merlins? I know these heads suck and are old school but I own them as they came on the boat, not looking to chase numbers with this boat really but before I do a valve job now would be the time if porting them is worth it....When I need a full refresh is when I will add some CI possibly and more aggressive solid rollers and better heads unless I can get numbers from these heads.
Anyone have ported flow sheets?
Anyone have ported flow sheets?
Imo any hand or custom port job would probably beat that, but guys hate doing iron by hand due to the time it takes.
Last edited by hogie roll; 10-13-2018 at 08:51 PM.
10-13-2018 | 09:29 PM
#9
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From: Grand Rapids, MI
My old Valako ported Merlins were wedged to 316 cc's and my flow #'s. Maybe not a true comparison, but hope it helps.
Lift___in. ex.
.200 151 133
.300 213 165
.400 277 222
.500 326 251
.600 362 254
.650 371 260
.700 377 262
Lift___in. ex.
.200 151 133
.300 213 165
.400 277 222
.500 326 251
.600 362 254
.650 371 260
.700 377 262
10-14-2018 | 06:39 AM
#10
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Joined: Oct 2005
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From: Olmsted Falls,Ohio Marblehead,Oh
Thanks, I have to refesh heads this winter so I thought about porting for cheap HP,Joe (Mild thunder) ran my engines on his Dyno sim and with a much better flowing head they made 50 more HP each, that may be worth it if I can get the numbers where they need to be...
my engines are 548 Dart tall deck shortblocks 11CC dome pistons
Merlin 345's
10.6:1
254/[email protected] .595/.595 LSA114 cams 1.7 Crane golds
Brodix HV2005 4500 intakes
Holly HP 1050 Dominators
my engines are 548 Dart tall deck shortblocks 11CC dome pistons
Merlin 345's
10.6:1
254/[email protected] .595/.595 LSA114 cams 1.7 Crane golds
Brodix HV2005 4500 intakes
Holly HP 1050 Dominators
